394279109 has 4 divisors (see below), whose sum is σ = 450604704. Its totient is φ = 337953516.

The previous prime is 394279103. The next prime is 394279129. The reversal of 394279109 is 901972493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 901972493 = 109 ⋅8274977.

It is a cyclic number.

It is not a de Polignac number, because 394279109 - 2²⁴ = 377501893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 394279109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394279103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28162787 + ... + 28162800.

It is an arithmetic number, because the mean of its divisors is an integer number (112651176).

Almost surely, 2^394279109 is an apocalyptic number.

It is an amenable number.

394279109 is a deficient number, since it is larger than the sum of its proper divisors (56325595).

394279109 is an equidigital number, since it uses as much as digits as its factorization.

394279109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56325594.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 394279109 is about 19856.4626507341. The cubic root of 394279109 is about 733.2767620043.

The spelling of 394279109 in words is "three hundred ninety-four million, two hundred seventy-nine thousand, one hundred nine".